RRCSetup

RRC message · TS 38.331 v19.4.0 (2026-09) · clause 6.2.2

RRCSetup is an RRC message of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v15.3.0 (2018-09) · Last changed v17.1.0 (2022-07), in RRCSetup-v1700-IEs

Definition

The RRCSetup message is used to establish SRB1.

RRCSetup ::=                        SEQUENCE {
    rrc-TransactionIdentifier           RRC-TransactionIdentifier,
    criticalExtensions                  CHOICE {
        rrcSetup                            RRCSetup-IEs,
        criticalExtensionsFuture            SEQUENCE {}
    }
}

Candidate change requests of v17.1.0

The CRs whose title or cover names this change, strong and likely matches only.

CR 3145 r2 (strong): Miscellaneous corrections for NR SL Relay

Fields (4)

Field	Description
rrc-TransactionIdentifier RRC-TransactionIdentifier
criticalExtensions CHOICE {
rrcSetup RRCSetup-IEs
criticalExtensionsFuture SEQUENCE {}

Fields of RRCSetup-IEs (4)

Field	Description
radioBearerConfig RadioBearerConfig	Only SRB1 can be configured in RRC setup.
masterCellGroup OCTET STRING (CONTAINING CellGroupConfig)	The network configures only the RLC bearer for the SRB1, mac-CellGroupConfig , physicalCellGroupConfig and spCellConfig .
lateNonCriticalExtension OCTET STRING · OPTIONAL
nonCriticalExtension RRCSetup-v1700-IEs · OPTIONAL

Fields of RRCSetup-v1700-IEs (3)

Field	Description
sl-ConfigDedicatedNR-r17 SL-ConfigDedicatedNR-r16 · OPTIONAL Cond L2RemoteUE since v17.0.0	Contains dedicated configurations for NR sidelink communication. The network configures only the PC5 Relay RLC channel and sl-PHY-MAC-RLC-Config used for the SRB1.
sl-L2RemoteUE-Config-r17 SL-L2RemoteUE-Config-r17 · OPTIONAL Cond L2RemoteUE since v17.1.0	Contains dedicated configurations used for L2 U2N relay related operation. The network configures only the SRAP configuration used for the SRB1 and local UE ID.
nonCriticalExtension SEQUENCE {} · OPTIONAL since v17.0.0

Used by (1)

DL-CCCH-MessageType